TIMPZ: An Exquisite Building Block for Metal/Hydrogen Coordination Polymers

TIMPZ: An Exquisite Building Block for Metal/Hydrogen Coordination Polymers

The novel polynitrogenated ligand tetra‐[4(5)‐imidazoyl]pyrazine (TIMPZ, 1) and its pincer complex of FeII are described. This ligand has an outstanding ability to aggregate in 1D‐superstructures by means of hydrogen bonding or metal chelation. TIMPZ shows an unprecedented conformational control ove...

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Bibliographic Details
Published in:European journal of inorganic chemistry Vol. 2019; no. 17; pp. 2291 - 2294
Main Authors: Ligiéro, Carolina B. P., Oliveira, Thiago V., Fontes, Chárbel C. F., Barragan, José T. C., So, Fernanda W. Y., Kubota, Lauro T., Nome, René A., Miranda, Paulo C. M. L.
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 08-05-2019
Subjects:
Absorption spectra
Assembly
Chelation
Coordination polymers
Fluorescence
Hydrogen
Hydrogen bonding
Hydrogen bonds
Inorganic chemistry
Iron
Ligands
Metal–organic frameworks
Superstructures
Supramolecular chemistry
Switches
Transition metals
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Description
Summary:The novel polynitrogenated ligand tetra‐[4(5)‐imidazoyl]pyrazine (TIMPZ, 1) and its pincer complex of FeII are described. This ligand has an outstanding ability to aggregate in 1D‐superstructures by means of hydrogen bonding or metal chelation. TIMPZ shows an unprecedented conformational control over the supramolecular assembly. Metal or hydrogen coordination switches the conformation of peripheral rings driving the assembly preferences. For [Fen(TIMPZ)n+1]2n+ complexes, UV/Vis spectroscopy shows a bathochromic shift of the main visible absorption band with higher “n” values. TIMPZ also has hydrogen‐bond triggered excited‐state intramolecular proton transfer (ESIPT) fluorescence, which is completely inhibited by chelation with transition metals. Polynitrogenated ligand TIMPZ shows an unprecedented conformational control over the supramolecular assembly triggered by metal or hydrogen coordination. [Fen(TIMPZ)n+1]2n+ pincer complexes and 1D coordination polymers feature bathochromic shift of the main visible absorption band with increasing “n” values. (TIMPZ)n 1D aggregates as large as 22 units, showing ESIPT fluorescence, were detected.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201900229